import java.util.*;

// Press Shift twice to open the Search Everywhere dialog and type `show whitespaces`,
// then press Enter. You can now see whitespace characters in your code.
/*
public class Main {
    public static void main(String[] args) {

      */
/*  ArrayList<Integer> arrayList  =new ArrayList<>();
        arrayList.add(1);
        arrayList.add(2);
        arrayList.add(3);
        for (int i = 0; i < arrayList.size(); i++) {
            if(arrayList.get(i) == 1) {
                return ;
            }
        }*//*

        HashSet<Integer> h=  new HashSet<>();
       h.add(1);
       h.add(1);
       h.add(1);

        Integer[] array = h.toArray(new Integer[h.size()]);
        for (int x:array) {
            System.out.println(x
            );
        }
        Stack<Character> s1 =new Stack<>()
    }
}*/
public class Main {
    public static void main(String[] args) {

        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.append('a');
        stringBuilder.append('a');
        stringBuilder.append('a');
        System.out.println(stringBuilder.toString().toUpperCase());
        int[] arr = {3,2,1};
        Arrays.sort(arr);
        for(int x: arr) {
            System.out.println(x);
        }

       /* List<Character> list = new ArrayList<>();
        list.add('s');
        list.add('b');
        list.add('a');
        System.out.println(String.valueOf(list));*/
/*
        Set<Integer> set = new HashSet<>();
        set.add(1);
        set.add(3);
        set.add(2);
        set.add(5);
        set.add(4);
        for(int x:set) {
            System.out.println(x);
        }*/
      /* Scanner in = new Scanner(System.in);
        float a = in.nextFloat();
        char b = in.next().charAt(0);
        int sum = 0;
        if(b == 'y') {
            if(a <= 1.0f) {
                System.out.print(25);
            } else {

                sum = 25+(int)Math.ceil(a-1);
                System.out.print(sum);
            }
        }
        if(b == 'n') {
            if(a <= 1.0f) {
                System.out.print(20);
            } else {
                sum =20+(int)Math.ceil(a-1);
                System.out.print(sum);
            }

        }*/
     /*   Scanner scanner = new Scanner(System.in);
        char b = scanner.next().charAt(0);
        if(b == 'y') {
            System.out.println("hhh");
        }*/

       /* Scanner in = new Scanner(System.in);
        String str = in.next();
        Stack<Character> s1 =new Stack<>();
        Stack<Character> s2 = new Stack<>();
        for(int i = 0;i < str.length();i++) {
            char ch = str.charAt(i);
            // 第一次进栈
            if(s1.isEmpty()) {
                s1.push(ch);
            } else {
                char ch2 = s1.peek();
                if(ch2 == ch) {
                    s1.pop();
                } else {
                    s1.push(ch);
                }
            }
        }
        //将s1栈放到s2栈中
        while(!s1.isEmpty()) {
            s2.push(s1.pop());

        }

        //打印
        if(s2.isEmpty()) {
            System.out.print(0);
        } else {
            while(!s2.isEmpty()) {
                System.out.print(s2.pop());
            }
        }*/

    }
}